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SAN MATEO (CBS SF) — The California Highway Patrol continued the search for the driver of a white pickup truck that caused a multi-car pileup on U.S. Highway 101 in San Mateo Sunday morning, killing one.

The crash was first reported at about 12:50 a.m., when the pickup truck — possibly broken down — was stopped in the left lane on southbound Highway 101 near Poplar Avenue, CHP Officer Art Montiel said.

As many as four vehicles collided behind the pickup truck, Montiel said.

A 29-year-old passenger in the back seat of a 2010 Mazda suffered major head trauma and was declared dead at the scene. The driver of the Mazda, a 30-year-old man from Palo Alto, was taken to Stanford University Hospital with major head injuries.

The occupants of three other vehicles involved in the crash were not injured.

The driver of the pickup truck fled the scene.

It had not been determined if drugs or alcohol were factors in the crash.

Anyone who might have witnessed the crash is urged to contact CHP Officer Graham at (650) 36-6261 ext. 308.

(Copyright 2012 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed)